Our Garden Peony

In my backyardovich 2010 drawing (which needs to be revised ) I named the peony, blooming here on the 7th of July 2009, 'Cornelia Shaylor'. I don't know why. Did I find a tag? Was is my best guess? I'm not certain. I'd would now think that it is P. lactiflora 'Sarah Bernhardt' if I didn't follow my notes. I wish I could find all those tags. Ahh, adopted gardens.